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Table 3 Relative odds of concussion according to multiple risk behaviour quartile within grade 6–8 students and grade 9–10 students

From: Adolescents’ engagement in multiple risk behaviours is associated with concussion

Multiple risk behaviour quartileUnadjusted model,
OR (95% CI)
Adjusted model, *
OR (95% CI)
Grade 6–8 students (n = 1976)
 Quartile 1 (referent)1.001.00
 Quartile 21.19 (0.80, 1.83)1.10 (0.68, 1.77)
 Quartile 31.31 (0.86, 1.99)1.22 (0.76, 1.96)
 Quartile 43.50 (2.40, 5.08)2.94 (1.90, 4.56)
Grades 9–10 (n = 1083)
 Quartile 1 (referent)1.001.00
 Quartile 22.35 (1.16, 4.74)2.21 (1.05, 4.65)
 Quartile 32.94 (1.49, 5.82)2.71 (1.32, 5.56)
 Quartile 44.74 (2.47, 9.09)4.67 (2.33, 9.35)
  1. OR, Odds ratio; CI, Confidence interval
  2. *Adjusted for age, gender, ethnicity, perceived family affluence, and body mass index z-score